n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 1 |
6 | 180 |
7 | 1 |
8 | 5040 |
9 | 20160 |
10 | 378000 |
11 | 1 |
12 | 59875200 |
13 | 1 |
14 | 6235669440 |
15 | 47221574400 |
16 | 1307674368000 |
17 | 1 |
18 | 533531142144000 |
19 | 1 |
20 | 126713646259200000 |
21 | 1219830034655232000 |
22 | 51090956251003468800 |
23 | 1 |
24 | 38778025108327464960000 |
25 | 25852016738884976640000 |
[0,1,1,6,1,180,1,5040,20160,378000,1,59875200,1, 6235669440,47221574400,1307674368000,1, 533531142144000,1,126713646259200000, 1219830034655232000,51090956251003468800,1, 38778025108327464960000,25852016738884976640000] |